The two lovebirds were previously spotted in a romantic getaway. But recently, the romance between the couple was nowhere to be found. The two seemed pretty distant from each other, with Aniston interacting more with Pal Courtney Cox.

While the tropical holiday in Mexico was spicing things up, Aniston and Theroux were found seemingly ignoring each other even as the couple sat side by side in the hotel deck. They announced their engagement to the public but the couple's love story hasn't been all that rosy.

Many rumors plagued the relationship, hinting at the couple's separation. After having been together for two years, they had announced to the public their desire to tie the knot but their current moves seem to dictate otherwise.

The long distance between the two is seen as a major factor straining the relationship as Aniston spends her time in Bel Air, Calif. while her other half Theroux spends time in New York.

While the couple's relationship might seem to be on the rocks, amid all the speculations, Aniston never failed to wow the crowd with her skimpy purple bikini she wore under the tropical heat. Theroux was found stealing glances at his bikini-clad fiancée, as he himself donned a black board shorts, highlighting his enviable rock-hard abs.

Is Jennifer Aniston heading towards a lonely road once again? Reliable sources said, "Most of Jen's friends expected this to happen because she's usually with guys for two years at the most before they break up."

Other sources added the two are slowing things down as "Jen and Justin have hit a rough patch. Right now, there are no wedding plans, no baby plans and no more buying houses together."

Shall the pair be able to face 2014 together? Or is Aniston going to be back to the singlehood market...for the nth time?